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A283598
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Numbers n such that all three of 6*n+1, 6*(n+1)+1, and 6*(n+2)+1 are semiprimes.
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0
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41, 42, 48, 84, 92, 148, 157, 158, 162, 189, 209, 210, 222, 223, 224, 225, 226, 234, 250, 306, 315, 316, 317, 318, 319, 326, 386, 387, 401, 407, 408, 433, 462, 487, 488, 489, 514, 515, 521, 532, 539, 566, 567, 568, 569, 580, 598, 633, 634, 662, 663, 664, 672, 697, 713, 717, 718
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OFFSET
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1,1
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COMMENTS
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That is, n, n+1 and n+2 are terms in A112775.
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LINKS
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MATHEMATICA
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po[x_]=PrimeOmega[x]; Select[Range[1000], po[6*#+1]==po[6*(1+#)+1]== po[6*(2+#)+1==2 &]
Select[Range[800], PrimeOmega[6#+{1, 7, 13}]=={2, 2, 2}&] (* Harvey P. Dale, Apr 23 2024 *)
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CROSSREFS
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KEYWORD
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nonn,changed
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AUTHOR
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STATUS
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approved
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